VS10的建模工具真有美感 - -bnr   回復(fù)  更多評論
  

@千暮(zblc)
截圖下來貌似有點(diǎn)變色..  回復(fù)  更多評論
  

這個是裝飾器模式嗎？？樓主請好好看看書。不要誤人子弟  回復(fù)  更多評論
  

@林
代碼來源于《大話設(shè)計模式》  回復(fù)  更多評論
  

#include <iostream>
#include <string>
using namespace std;

class Beverage
{
public:
Beverage():description("Unknown Beverage")
{

}
virtual std::string getDescription()//:description = "Unknown Beverage"
{
return description;
}

virtual double cost() = 0;
//{
// return 0;
//};

string description ;

protected:
private:

};


class CondimenteDecorator :public Beverage
{
public:
virtual string getDescription() = 0;
//{
// return description;
//}
protected:
private:
};


class Espresso :public Beverage
{
public:
Espresso()
{
description = "Espresso";
}


double cost()
{
return 1.99;
}
};


class HouseBlend :public Beverage
{
public:
HouseBlend()
{
description = "HouseBlend";
}


double cost()
{
return 0.99;
}
};


class DarkRoast :public Beverage
{
public:
DarkRoast()
{
description = "DarkRoast";
}


double cost()
{
return 0.88;
}
};


class Mocha :public CondimenteDecorator
{
public:
Mocha(Beverage *bevergage)
{
this->bevergage = bevergage;
}

string getDescription()
{
return bevergage->getDescription() + string(" Mocha");
}

double cost()
{
return 0.20 + bevergage->cost();
}
protected:
private:

Beverage *bevergage;
};


class Whip :public CondimenteDecorator
{
public:
Whip(Beverage *bevergage)
{
this->bevergage = bevergage;
}

string getDescription()
{
return bevergage->getDescription() + " Whip";
}

double cost()
{
return 0.40 + bevergage->cost();
}
protected:
private:

Beverage *bevergage;
};


class Soy :public CondimenteDecorator
{
public:
Soy(Beverage *bevergage)
{
this->bevergage = bevergage;
}

string getDescription()
{
return bevergage->getDescription() + " Soy";
}

double cost()
{
return 0.40 + bevergage->cost();
}
protected:
private:

Beverage *bevergage;
};




#include "Beverage.h"


int main()
{
Beverage *pBeverage = new Espresso;

std::cout<<pBeverage->getDescription().c_str()<<" $"<<pBeverage->cost()<<std::endl;


Beverage *pBeverage2 = new DarkRoast;
pBeverage2 = new Mocha(pBeverage2);
pBeverage2 = new Mocha(pBeverage2);
pBeverage2 = new Whip(pBeverage2);
std::cout<<pBeverage2->getDescription().c_str()<<" $"<<pBeverage2->cost()/**/<<std::endl;

Beverage *pBeverage3 = new HouseBlend;
pBeverage3 = new Soy(pBeverage3);
pBeverage3 = new Mocha(pBeverage3);
pBeverage3 = new Whip(pBeverage3);

std::cout<<pBeverage3->getDescription().c_str()<<" $"<<pBeverage3->cost()<<std::endl;

return 0;

}


這才是真正的裝飾模式！  回復(fù)  更多評論